Development Of Regenerative Braking System And In-wheel Motor Driving Controller For Super Micro-electric Vehicle

With the global energy shortage and environmental pollution, greatly promotion the development of electric vehicle, the Chinese government advocates the universities and enterprises to further increase the strength of research and development of electric vehicles. Because of the battery and charging technology Limited, the electric vehicle has not gained popularity very quickly, and the micro electric vehicles will soon be applied, showing a good development space and market prospect. The number of the elderly population increasing in China, in order to facilitate the elderly travel, so that super micro electric vehicles has become an important research topic.This paper mainly regenerative braking study of in-wheel for motor the super micro electric vehicle, starting from the theory and the technical level, analysis of the micro electric vehicle regenerative braking theory and control method, combined with modern technology, development and implementation of in wheel motor controller. The bench test about in-wheel motor regenerative braking energy effect. Specific content is subdivided into the following several aspects:① According to the characteristics of the micro electric vehicle speed is not very high and frequent braking, designing a three-phase brushless DC in-wheel motor braking scheme, analysis of the constraint conditions, selecting the appropriate control strategy.② Designing and developing the hardware of in-wheel motor controller for the super micro electric vehicle, including the regenerative braking inverter control circuit, the switch tube driving circuit, the rotor position detection circuit, the in-wheel motor current detection circuit, the power supply circuit, the CAN communication circuit, the electromagnetic clutch driving circuit. Taking all factors into consideration, such as the shape of the controller, cooling, and the electromagnetic interference and the installation position of Holzer sensor, the in-wheel motor regenerative braking controller is designed.③ Editing and developing of regenerative braking control software system for the super micro electric vehicle, including the main program, interrupt program, CAN communication program, regenerative braking current fuzzy PID control program, the protection program.④ In order to complete the in-wheel motor braking test, designing of the regenerative braking control scheme, Three-dimensional Design Software Solidworks is used to develop in-wheel motor brake test bench, introducing the functions of main components, in view of the part fixed wheel motor made a detailed analysis. In this paper, the experimental data acquisition system based on virtual instrument Lab VIEW is designed.⑤ The hardware and software of the in-wheel motor controller are tested, and existing problems of hardware and software are analyzed. In braking test, by adjusting the PWM duty cycle is to regulate the size of electric braking force, to further complete the corresponding regenerative braking test. With the experimental data effectively processed, drawing the corresponding speed curve, the super capacitor voltage curve, and the energy recovery curve. And the test results were analyzed, the corresponding conclusions are obtained.